使用Regex / PHP将字符串中的第一个数字替换为连续数字

Question

I have that string : $text=70ac0f2e7247e9a658f71fe6362bf53

I want to replace all consecutive numbers by only the first number. For example I want to replace 70 by 7, 7247 by 7, 658 by 6 and so on.

I have this pattern : $pattern = '/[0-9]{2,}/'; but I don't know how I could build the $replacement and the preg_replace to make :

preg_replace ($pattern2,$replacement,$text3);

Thank you !

Answer 1

Turning my comment into an answer, you need to use a capturing group:

preg_replace('/([0-9])[0-9]*/', '$1', $text3);

or like what @chris85 said you may go with a match resetter \K:

preg_replace('/[0-9]\K[0-9]*/', '', $text3);